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Summary Of Significant Accounting Policies (Schedule Of Basic And Diluted Income Per Common Share From Continuing Operations Calculations) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Accounting Policies [Abstract]      
Income from continuing operations $ 121,764 $ 101,686 $ 100,986
Income from continuing operations available to participating securities (242) (143) (174)
Income from continuing operations available to common shareholders $ 121,522 $ 101,543 $ 100,812
Weighted average common shares outstanding - basic (in shares) 27,336 27,300 27,264
Incremental share effect from:      
Nonparticipating restricted stock (in shares) 3 3 3
Stock-settled stock appreciation rights (in shares) 34 24 41
Weighted average common shares outstanding - diluted (in shares) 27,373 27,327 27,308
Income per common share from continuing operations - basic (in dollars per share) $ 4.45 $ 3.72 $ 3.70
Income per common share from continuing operations - diluted (in dollars per share) $ 4.44 $ 3.72 $ 3.69